Alignments of five or more planets are rare—there will be two more featuring five or more planets this year, but after that the next won’t happen until 2040.

"This is, incidentally, why we sometimes observe planets appearing to approach closely to each other on the sky, as we view them along a line while they careen around the cosmic r

The seven planets will not be perfectly aligned, but will appear in an arc across the sky due to their orbital plane in the Solar System.